Retell Realtime Voice And Interruption

On a noisy line the agent keeps stopping mid-sentence because background noise is treated as the user interrupting.

Tune interruption_sensitivity (0-1): lower it so it is harder to interrupt the agent on noisy lines; raise it when users complain they cannot cut in. Verify on representative audio rather than guessing a value.

The user starts speaking while the agent is mid-utterance. The agent keeps talking over the user for several seconds.

On a detected barge-in, stop TTS playback promptly and listen, then respond to what the user actually said. Talking over the caller signals a broken interruption pipeline; verify playback truly halts, not just that a new turn is queued.

Operator enables enable_backchannel for a warm support agent but sets the frequency so high the agent says 'uh-huh' over the caller constantly.

Enable backchannel and tune backchannel_frequency so affirmations are occasional and natural, not constant. Backchannels should signal listening without disrupting the caller's flow; verify on a real conversation.